Another batch of P0202 constepr algirithms. remove/remove_if/remove_copy/remove_copy_if/reverse_copy, and tests (commented out) for rotate_copy, because that depends on std::copy

llvm-svn: 323152

1 files changed, 19 insertions, 1 deletions

diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp
index 70840d187bf..ec9aa9e94ab 100644
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp
@@ -10,14 +10,28 @@
 // <algorithm>
 
 // template<BidirectionalIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
-//   OutIter
+//   constexpr OutIter          // constexpr after C++17
 //   reverse_copy(InIter first, InIter last, OutIter result);
 
 #include <algorithm>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
+#if TEST_STD_VER > 17
+TEST_CONSTEXPR bool test_constexpr() {
+    int ia[] = {1, 3, 5, 2, 5, 6};
+    int ib[std::size(ia)] = {0};
+    
+    auto it = std::reverse_copy(std::begin(ia), std::end(ia), std::begin(ib));
+
+    return std::distance(std::begin(ib), it) == std::size(ia)
+        && std::equal   (std::begin(ia), std::end(ia), std::rbegin(ib))
+           ;
+    }
+#endif
+
 template <class InIter, class OutIter>
 void
 test()
@@ -78,4 +92,8 @@ int main()
     test<const int*, bidirectional_iterator<int*> >();
     test<const int*, random_access_iterator<int*> >();
     test<const int*, int*>();
+
+#if TEST_STD_VER > 17
+    static_assert(test_constexpr());
+#endif
 }